HEAT EXCHANGER Russian patent published in 2010 - IPC F28D7/10 

FIELD: heating systems.

SUBSTANCE: invention refers to heat engineering and can be used as high heat-stressed heat exchanger of nuclear power plant with hydraulic scheme of two-sided heat exchange of heated liquid. Heat exchanger contains external, intermediate, internal tubes installed coaxially and with an annular gap one in the other, external one of which is fixed in tube sheet, upper and lower reducers with overflow openings; at that, openings of upper reducer are interconnected with annular gap between intermediate and internal tubes, and annular gap between external and intermediate tubes is connected through openings of lower reducer to internal tube; the latter is taken out with its upper end beyond external tube and fixed in additional tube sheet; channels have variable open flow area which increases in direction of medium movement, and their axes are located at an equal angle to longitudinal axis of heat exchanger.

EFFECT: design of proposed heat exchanger will allow using it as module of steam-generating plant of submersible type, which meets the requirements for reliability, manufacturability, erection at high specific heat stresses of the occupied volume of nuclear power plant.

3 dwg